Dimensions of a pen????

A farmer plans to use 25m of fencing to enclose a rectangular pen that has area 63 m^2. Only three sides of the pen need fencing because part of an existing wall will be used for one of the longer sides. Find the dimensions of the pen.

A farmer plans to use 25m of fencing to enclose a rectangular pen that has area 63 m^2. Only three sides of the pen need fencing because part of an existing wall will be used for one of the longer sides. Find the dimensions of the pen.

Let the other long side be of length
Let the other two short sides be of length each